Air-pump.



U. H. BELDEN.

AIR PUMP.

APPLICATION FILED JUNE 22, 1909.

960,789, Patented June '7, 1910.

ANDREW B. GRAHAM cu. PHOTO-UTHOCRAFNERS WASHINGTON. DA:

CHARLES H. BELDEN, 0F CLIFTON SPRINGS, NEW YORK,

AIR-PUMP.

Specification of Letters Patent.

Patented June 7, 1910.

Application filed June 22, 1909. Serial No. 503,738.

To all whom it may concern:

Be it known that I, OHARLns H. BELDEN, of Clifton Springs, in the countyof Ontario and State of New York, have'invented a new and usefulImprovement in Air lPumps, which improvement is fully set forth in thefollowing specification and shown in the accompanying drawings.

This invention relates to certain new and useful improvements in airpumps, and more particularly to that class designed primarily forinflating pneumatic tires.

In this class of pumps as heretofore constructed, the operating handleis liable to become loose from use, and the construction of the pump hasbeen such that this looseness of the handle and the parts immediatelyassociated therewith has caused a leak at the upper end of the barrelwhich has been annoying.

One of the objects of the present invention is to overcome thisobjection. In my present improvement the construction is such that ifthe handle gets loose, it has no effect whatever upon the joint at thehandleend of the pump.

Another object of the invention is to simplify and improve theconstruction of the pump, making it practically a two-barrel pump, yetcapable of doing the same work as has been done by the known forms oftriple-barrel pump designed for this purose.

p Other objects and advantages of the invention will hereinafter appearand the novel features thereof will be particularly pointed out in theappended claims.

The invention is clearly illustrated in the accompanying drawings,which, with the numerals of reference marked thereon, form a part ofthis specification, and in which Figure l is a side elevation of myimproved pump with portions broken away ancl parts in section. Fig. 2 isa side elevation, on an enlarged scale, with portions omitted, partsbroken away and various parts shown in section. Fig. 3 is a crosssection of the main barrel on the dotted line a in Fig. 2, the upperportions being omitted and the plunger rod shown in cross section, as onthe dotted line b in Fig. 4:, looking in the direction of the arrows.Fig. 4 is a side elevation of parts at the upper end of the innerbarrel, parts being broken away and portions shown in section. Fig. 5 isa plan of parts at the upper end of the inner barrel, the cap beingomitted and the plunger rod being transversely sectioned, as on thedotted line 0 in Fig. 41, looking in the direction of the arrow, aportion of the cage being broken away. Fig. 6 is a side elevation of thecage, detached. Fig. 7 is a substantially central longitudinal sectionof the cage and some of the associated parts, showing the disk valvesand the actuating spring therefor, the plunger rod being shown inelevation.

Like numerals of reference indicate like parts throughout the severalviews.

Referring to the drawings, 1 is the main barrel of the pump.

2 is a head secured rigidly to the upper end of said barrel in anysuitable manner, being pierced centrally for the passage of the upperreduced threaded end 8 of the plunger rod 4. This rod is formed with aninclined or conical shoulder 5, seen clearly in Figs. 2, 3 and 4, whichmeets the inner surface of the closing cap or head 2, as seen clearly inFig. 2, when the parts are together. A screw nut 6 on the threaded end 3of the rod 4: is turned down tightly against the raised central portion7 of the cap 2, as seen in Figs. 1 and 2. When thus screwed down rigidlyto place, the barrel 1 and the rod 4, with connected parts, all move asa single body when the pump is being operated. This beveled shoulder5,fitting as it does tightly against the inner circular cornor 8 of thecap 2 when the nut is tightened, forms an air-tight joint, which is animportant feature of the construction, as will be hereinafter more fullyset forth.

9 is the handle. It is of the form usual in such devices, being slippedon the outer end of the rod 4 after the nut 6 has been tightened firmlyto place so as to make the joint between the rod and the cap perpetuallytight independent of the handle, the handle then being secured by meansof a nut 10,- as seen in Fig. 1, the handle being held down against thenut 6 but entirely independent of the latter so far as loosening itshold upon the cap 2 is concerned. Suitable washers, as 11 and 12, maysometimes be employed if desired between the handle and the nuts 6 and10, although this is not' considered essential.

13 is a stirrup at the lower end of the pump, the pump being designedfor use in a vertical position with the foot upon the stirrup to holdthe pump rigidly in place while operating the same, the upward anddownward motions of the handle 9 carrying the outer barrel 1 and theplunger rod 4 upward and downward as a single element.

14 is the inner barrel. It is provided near its upper end with a basering 15 threaded thereon and holding a fibrous or leather cup 16, of anywell-known or preferred construction, a ca ring 17 being threaded on itsextreme end. ithin the upper end of the barrel 14 is inserted a cage 18,seen detached in Fig. 6, the same being provided with a flange 19resting directly upon the upper end of the barrel and immediatelyclosing the same, the flange and the barrel having the same diameter.This cage is further formed with an annular band or portion 20immediately beneath the flange 19 which also fits closely to theinterior of the inner barrel 14. Below this portion 20, the cage isreduced in external diameter, as seen at 21 in Figs. 6 and 7, leaving anarrow space all around the same between it and the inner surface of thebarrel, as seen clearly at 22 in Fig. 4. This cage is also formed withopenings 23, as seen in Figs. 4 and 6, for the passage of air into thebarrel, as will be explained as the description proceeds. ithin thiscage is placed a disk valve or the like 24 of suitable material,preferably soft yielding leather saturated with oil or other lubricant,beneath which is a slender spring 25 normally holding the packingmaterial upward at the mouth of the cage. The lower end of this springbears against the inner wall of the bottom of the cage, as will bereadily understood upon reference to Fig. 7. As seen in Fig. 7, thevalve may comprise a plurality of rings or layers, if found desirable.-The upper end of the cage is directly pressed by the cap or part 17, thelatter being screwed down firmly against the cage. The part 17 is formedslightly concave within, as shown at 26, against which the valve 24 isnormally mildly pressed by the slender spring 25, as seen in Figs. 4 and7.

As shown in Figs. 3, 4 and 7, there is an annular space 27 between therod 4 and the opposing inner portion of the part 17 down through whichair may pass. Also the valve 24 is less in diameter than the interior ofthe cage, leaving an annular space 28 all around through which air mayflow to the interior of the cage, see Figs. 5 and 7. The valve 24, beingvery soft and yielding, takes the form of a small cone 31, shown inFigs.

4, 5 and 7, fitting the slightly conical form' 26 on the interior of thepart 17 this conical part 31 being at the top of the valve, and a merering, as shown. The lower part or section 32, Fig. 7, with the valve 24,is an ordinary metal or iron washer against which the spring 25 directlypresses, the valve 24 being between this ring or washer and the innersurface of the part 17.

\Vhen into the interior of the cage, the air may flow freely outwardthrough the two openings 23, thence downward along the outside of thecage into the barrel 14, as indicated by numerous arrows in Fig. 4.

Now it remains only to describe the working of the parts within thebarrel 14. The lower end of the rod 4 is provided with a cup-leather 33,Fig. 2, in principle the same as the cup-leather 16 at the top end ofthe barrel 14, which, when the handle 9 is pulled upward, passes idlyupward through the compressed air in the barrel 14, the air passingreadily downward by and past the yielding cup-leather 33. But, when thehandle is pressed downward, the air in the barrel 14 below thecup-leather 33, not being able to escape'upward by or past thecupleather 33, will be forced downward into the chamber 34 of thestirrup 13 and so outward through the short bent tube 35. This deliverytube is of common construction, a hose being attached to it andconnected with the tire to be inflated, all in the lsual manner.

There is a check valve in the bent tube of usual construction (notshown) to prevent the air from passing backward into the pump when thehandle 9 is again drawn upward. A spring 36, Fig. 2, is shown on the rodabove the cup-leather 33, which acts as a sort of a buffing spring tostrike the lower end of the cage when the rod is pulled upward. Aclosing head 37 is threaded upon the lower end of the barrel 1 which,when the pump is worked, glides smoothly along the outer surface of thetube 14, the latter being rigid and stationary.

From the above, it will be understood that, (assuming the pump in theposition shown in Fig. 1) when the handle 9 is drawn upward, the space29 in the barrel 14 above the cup-leather 16 of the barrel 14, will fillwith air drawn inward through openings near the bottom end of the barrel1, one being shown at 30, Fig. 1, and passing upward by thecup-leather16 which, in this action of the parts, yields inwardly toallow the air to pass into the upper end of the barrel 1 above thecup-leather 16.

When the handle is pressed downward, the air in the barrel 1 above thecup-leather 16, not being permitted to pass downward by the cup-leather16, will be forced through the circular opening 27 of the part 17 aroundthe rod 4. This pressure of the air against the valve 24 will force thatslightly down ward away from the concavity 26 against the action of thespring 25 and so open a continuous air passage into the cage and thenceinto the barrel 14, as above described and indicated in Fig. 4. Thus,the interior of the barrel 14 will be filled with air compressed by theforcing downward of the again drawn upward, the air in the barrel 14cannot escape back through the cage as the spring 25 immediately forcesthe valve 24 snugly against the concave seat thereof against the part 17The lower end of the barrel 14 is threaded into the chamber 34, in thehead of the base piece or stirrup 13, leaving space beneath for theoutflow of the forced air into the tube 35. When the operator of thepump gets his weight onto the handle 9 to force the outer barrel 1 andthe rod 4 downward, he is simultaneously operating two pumps, as itwere, the outer pump forcing air into the inner barrel, and thecup-1eather 38 forcing air already compressed in said barrel into thetire.

Modifications in detail may be resorted to without departing from thespirit of the invention or sacrificing any of its advantages.

IVhat is claimed as new is 1. In a pump of the class described, thecombination with the inner barrel and the plun er rod, of a cage havingopenings and annu ar portions of different diameters, a valve within thecage, and a cap on the upper end of the cage, there being a spaceprovided between the cage and barrel and a space between said valve andcage and a space surrounding said rod for the passage of air.

2. In a pump of the character described, the combination with the innerbarrel and the plunger rod, of a cage having annular portions ofdifferent diameters and openings, a valve, a spring within the sameacting on the valve, and a cap at the upper end of the cage having aconcaved portion receiving said valve, there being an annular spacebetween said rod and the opposing inner portion of said cap and a spacebetween the valve and cage.

8. In a pump of the character described, the combination with the innerbarrel and the plunger rod, of a cage having openings, a valve, a springw1th1n the same acting on the valve, and a cap at the upper end of thecage having a concaved portion receiving said valve, said valve beingelastic and having a conical upper end there being an annular spacebetween said rod and the opposing inner portion of said cap, said valvebeing of less diameter than the interior of the cage.

4:. In a pump of the character described, the combination with the innerbarrel and the plunger rod, of a cage having openings and annularportions of different diameters, a cap over the upper end of the cage,and a spring-pressed valve within the cage, there being a space betweenthe cage and barrel and a space between the valve and cage and a furtherspace between the rod and the walls of the cap through which it passes,for the passage of air.

In witness whereof, I have hereunto set my hand this 18th day of June,1909, in the presence of two subscribing witnesses.

CHARLES H. BELDEN.

IVitnesses .AL'rA E. KnLLocc, EMBUKY J. BEAL.

